Following his ouster from the White House on Friday, he will return to managing the right-wing media outlet Breitbart News — just as he was doing before he joined the campaign last year and then the staff of the West Wing.

Here is a guide to The New York Times’s coverage of the right-wing agitator who worked for Mr. Trump for one year and a day.

Building up the base

In the years before joining Mr. Trump’s campaign, Mr. Bannon was known as a hard-charging, obscenity-hurling manager at Breitbart News, where he became executive chairman in 2012. His stewardship was a success, turning the once-fringe media outlet into a force to be reckoned with.

Eight days after Mr. Trump’s inauguration, Mr. Bannon, who was serving as chief strategist, was given a seat on the principals committee of the National Security Council, a position customarily reserved for military generals.

Ebbs and flows

There were signs of schisms in the White House, including what appeared to be growing rifts between Mr. Bannon and Jared Kushner, the president’s son-in-law and trusted adviser; Gary D. Cohn, the director of the National Economic Council; and Lt. Gen. H. R. McMaster, the national security adviser.

Hitting the exit ramp

Seeking to impose discipline on a turbulent White House staff, Mr. Trump named John F. Kelly, a retired four-star general who was secretary of homeland security, as the new chief of staff on July 28.

After Mr. Trump was criticized for saying “many sides” were responsible for violence at an Aug. 12 rally in Charlottesville, Va., Mr. Bannon defended the president and the rally. “Just give me more,” he said. “Tear down more statues. Say the revolution is coming. I can’t get enough of it.”